Post-engine swap trans error code p2716 (1 Viewer)

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Hi all,
My mech has just completed an engine swap in my 2013 Sahara with a new crate engine, new rad, starter motor etc.
All seemed to go well with the engine and the car fired right up but had some dash warning lights an upon running the scan tool error p2716 came up which is related to the transmission pressure solenoid. Tried to clear the error to no avail and it’s producing thrashy gear changes and sub par performance.
So far they’ve checked the trans fluid which was all good.
Checked the solenoid and it’s functioning normally.
They’ve done a pin out test on the engine loom and everything looks good there with continuity through every pin.
Pulled the ECM and opened it up to check for corrosion etc. but all looks normal (plus there was no issue like this prior to the swap so the ECM as the culprit seems pretty unlikely.
Have checked the orientation of the trans speed sensor plugs (swapped them back and forth) To no avail.

Wondered if anyone has experienced anything similar or has any suggestions for things we haven’t tried yet?
Appreciate it!
 

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